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- The world's first installed parking meter was in Oklahoma City, on July 16, 1935. Carl C. Magee, of Oklahoma City, Oklahoma, is generally credited with originating the parking meter. He filed for a patent for a "coin controlled parking meter" on May 13, 1935.
- Oklahoma's Cimarron county is bordered by more states than any other U.S. county: Oklahoma, Texas, New Mexico, Colorado and Kansas.